Boat davit



JulyZZ, 1930. J. w. BOURNIER IBOAT DAVIT Fi l'ed Jan. 30. 2Sheet-Sheet 1 v INVENTOR 'io'r WITNESS ATTORN EY July 22, 193.0.- J. W.2BOURNIER 1, 7 2

BOAT DAVIT Filed Jan. 30,1929 2 sheets-sheet- 2 INVENTOR WITNESS v L J a I GB .5 By 772%} ATI'ORN EY Patented July 22, 1930 JnLInnw. BOURNIER, or V'IAMPA, FLORIDA,

oar nAvI'r Application filed January 30, 19 29S'Seria1 1T0.'336,269.

upending of a boat during launching.

further object of the invention is the provision of means for maintaining a boat a fixed distance from the side of a ship, during launching.

Astill further object of the invention is the provision of a 'davit which is vertically movable upon the sides of a ship so as to bring the clavit into close proximity of the water, thereby enabling the laun hing of' a boat in a gradual manner.

A stillfurther object of the inventionis to provide a davit in which the use of blocks and tackles are eliminated for effectingraising and loweringa boat. 7

Additional objects, advantages and; "features of invention will be apparent from the following description and drawings, forming a art of this application',.in which having'niy davit installed thereon, the movenient of 111188, I, j i v I 'F1gure2 is a side view thereof,

of Figure 1."

the davit. being indicated in dotted Figure 3 is a fragmentary top plan View, Figured is a cross section on the line /1'4 ofFigureEli 7V Figure '5 is cross section on the line 5-5 In carrying ont my invention I provide a track 1, mounted-upon the side of a Vessel 2.

,vTh'e track --1 ,'.in the present instance, comprises two spaced sections 3 constructedto The carriage 4 comprises-a pair of trianguylarly shaped supports 5 being connected by a float 6. Guiderollers 7 are mounted :upon

one side :of the support'e and are of a size to be rotatably receivedwithin thetracksl, as clearlyshown in Figures 1, and? Upon the npper part "of the carriage 4fhooks or eyelets 8' are it provided, in which a cable" Qis secnredfthe' cable being trained about a" pul will be apparent;

detail;v .7 i i q, -The portion of the boo1n15, adjacent the ley 1 0, lfroni whence it is extended to a winch or other hoisting means, not shown. The upper, horizontal portions of the supports :5 are provided with bearings 11 and 12, in which there are engaged shafts 13and 14, respectively, r v v Upon the shaft 13 there are keyed a pair of booms 15, adapted to move with rotation of the shaft, as will be explained invgreater shaft 13 is enlarged as at l6 and has an arcuate slot 17".v The outermost edge of the slot is provided with gearteeth 18 for intermeshin with a gear 19 keyed upon the shaft 14.

a .A sprocket wheel 20 is free upon theshaft lhin alinement with a sprocket wheel 21 car -ried by the shaft 13, and, a chain22 istrained about the sprocket wheels 20 and 21.

A Worm gear 23 is secured to the shaft 13- operable through a gear 241nountednpon the shaft Upon the opposite end of the shaft 25 there is keye'd'a bevel gear 26 arranged to mesh with a similar gear 27 oarriedby the hand-wheel28.

igure 1 is a cross sectional View of aship A clutch 29 is provided between the gear 19 and: sprocket 20, whereby the sprocket 20 will be locked to the-gear 19in outward move- 7 ment oftheboom, butwill be released upon 31 upon tlie gear 19 for engagement with th ratchet gear 30, 1 i i i i v A hand wheel 321 is secnredupon'the shaft 14 fora purpose hereinafter explained. V

The boat is denoted by 33, and is provided with-eyelets 3% for; engagement by "quick-detachable hooks 35.jcarriedby the booms 15.

The track 1-,;in the present instance, is

shown as two, angle iron members, substantially U-shaped 1n ClfQSSfiQClZlOIl then open ends being presentedtoward one another,

thereby forming a channel Within which the guide rollers?" may slide'or rotate. In thefweidedf tothe sides 'ofthe ship and .in the case a wooden structure is 1nvolved,,thera1ls 1 ay befpi 'ovided with properfastenings, as

PI ATE N 'IQOFF ICE 7 case ofmetallic vessels these rails may be The rails 1 are spaced a sufiicient distance apart to accomodate a boat to be lowered, and of a length to extend from the uppermost deck to a point well below tlie'water line of the vessel. 1

Reference is now made to Figure 2, where v in it will'be'seen that a boom 15 is disposed traverses the. gear 18 in a reverse directionv 'is likewise caused to rotate, and consequently rotates the sprocket wheel 7 21. Motion is transmitted from-the sprocket wheel 21 to the shaft 14 by virtue of the chain 22 and sprocket wheel 20.

It will be seen that withtherotation of the shaft 14, the booms 15 will be caused to swing into vertical position, due to the fact that the gear 19 traverses the arcuateshaped gear 18, an'd,aswill be understood such movement of the booms will elevatethe boat 33 into a vertical position.

With the booms 15 in elevated position, the'weight of the boat is-disposed upon the carriages 4. and by operation of a winchor other suitable means the cable 9 may be slackened, allowing the'davittoslide downwardly in the rails 1 into close; proximity of the water. Furthermanipulation of the hand-wheel 28, by an operator within the boat 33, will effect a further movement; of the booms 15, until they assumea POSlt/IOD. substantially horizontal to the vessel 2, as

indicated at A in-Fig. 1. Thus,the; boat 33 is held a spaced distance from the'vessel 2, and by reason of the short connection between the boat 33 and booms: 15, the boat 33 i's held against excessiveiswinging movement in any direction. 7

After launching ofthe boat 33 ,the'davit is returned to its uppermostrposition, by operation of the winch. In this position, it

would be'well to explain, that the booms 15 are still in their outwardly swung position. Relation of'the hand wheel 32 will transmit rotary movement to the gear 19 since the clutch 29 is inefiective in rearward movement ofthe. booms. Therefore, the gear 19 to that through which it passed in outward movement of the booms, and consequently brings the davit into its upon the vessel 2.' Y H I V By providing the float 6 at the' lower ex original position tremity of the supports 5, a more steady. launching of thefboat 33 is :eifected, since" the fioat will cause movement, of the davit to correspond to that of the waves or water, in which a boat is being launched.

I claim:

1. In a davit, a support, guide rails thereon, a carriage slidable in said guide rails, booms carried by said carriage, means carried by said booms for swinging and fixedly positioning said booms relative to said carriage, and means for raising and lowering said carriage within said rails.

2. A davit comprising a supporting structure, vertically disposed guide rails, a carriage, said carriage having rollers adapted to be received within said guide rails, booms carried by said carriage, means carried by said booms for swinging and fixedly positioning said booms relative to said carriage, and means to raise and lower said carriage.

3. A davit comprising a-supporting structure, vertically disposed guide rails, a carriage, said carriage having rollers adapted to be received within said guide rails, booms carried by said carriage, said booms having an arcuate gear, a second gear in mesh therewith, and means carried by said booms for operating said first and second named gears.

4. A davit comprising a supporting structure, vertical guide rails thereon, a carriage slidable thereon, swinging booms carried by said carriage, said booms being enlarged and.

having an internal arcuate gear, a gear mounted upon said carriage and in mesh with said arcuate shaped gear, and means carried by said booms for operating said gears.

5. A davit comprising a supporting structure, spaced parallel guide rails carried thereby, supports slidably mounted within said rails, a pair of shafts connecting said supports, a pairof booms swingably mounted upon one of said shafts, sprocket wheels carried by each of said shafts, a chain trained about said sprockets, an arcuate gear carried by each of said booms, a gear carried by one of said shafts and in mesh with said arcuate shaped gear, and meanscarried by said booms for operating said sprocket wheels.

6. A davit comprising a supporting structure, spaced parallel guide rails carried thereby, supports slidably mounted within,

said rails, a pair of shafts connecting said supports a pair of booms swingably mounted upon oneof said shafts, sprocket wheels carried by each of said shafts, a chain trained about said sprockets, an arcuate gear carried by one of said shafts and in'mesh with said arcuate-shaped gear, a clutch-con- .necting' said last named gear and said sprocket wheel, a gear carried by said other named shaft, a rotatable shaft carriedby said booms, a, worm gear fixed upon one end of saidshaft and in mesh with the last named gear, means for operating said shaft to effectoutward swinging movement of said boomsand means for operating said other-- 

